#16007: give solution constants of ODEs unique names
-------------------------------------+-------------------------------------
Reporter: rws | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.3
Component: calculus | Resolution:
Keywords: | Merged in:
Authors: Ralf Stephan | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/rws/ticket/16007 | 92a3fa3739fb069939c741cb310a0ba3cddad9fe
Dependencies: | Stopgaps:
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Comment (by kcrisman):
> > We ''might'' prebind `_C` etc. if someone thinks it's too difficult
for users otherwise.
> I would like to. How would I do it?
I think my point is that presumably if one then retyped the answer, or
tried to use it somehow, one would get an error about an undefined
variable.
{{{
sage: var('d')
d
sage: y=function('y',x); eq=diff(y,x)==d*x; eq
D[0](y)(x) == d*x
sage: desolve(eq,y,ivar=x)
1/2*d*x^2 + c
sage: c
---------------------------------------------------------------------------
NameError Traceback (most recent call
last)
<ipython-input-4-2cd6ee2c70b0> in <module>()
----> 1 c
NameError: name 'c' is not defined
}}}
That said,
{{{
sage: D = desolve(eq,y,ivar=x)
sage: D.subs(c=3)
1/2*d*x^2 + 3
}}}
works. So I would be comfortable with very good documentation or
something ahead of time - and Nils' comment indicates that better
documentation for how to use these is best.
--
Ticket URL: <http://trac.sagemath.org/ticket/16007#comment:23>
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